In the figure, the current in a solenoid having no appreciable ...

[K@]

In the figure, the current in a solenoid having no appreciable resistance is flowing from b to a and is decreasing at a rate of 9.6 A/s. The self-induced emf in the solenoid is found to be 8.4 V.
 
  (a) What is the self-inductance of the solenoid?
  (b) Which point, a or b is at higher potential?
 
  What will be an ideal response?

Question 2

Suppose that you wish to construct a simple ac generator having an output of 12 V maximum when rotated at 60 Hz. A uniform magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns do you need?
 
  A) 8
  B) 16
  C) 32
  D) 64
  E) 128

[Bigfoot1984]

Answer to Question 1

Answer: (a) 0.88 H (b) point a

Answer to Question 2

Answer: D